Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing lime nitrogen by using thiourea production waste residues

A technology of lime nitrogen and waste residue is applied in the field of preparing lime nitrogen from thiourea production waste residue, which can solve the problems of polluting the environment and ineffective utilization of waste residue, and achieves the effects of reducing carbon dioxide emissions, solving environmental protection problems and realizing recycling.

Inactive Publication Date: 2018-11-13
SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Waste slag has no effective utilization method, and it slowly releases hydrogen sulfide and ammonia during storage, seriously polluting the environment
This has brought great challenges to the survival and development of thiourea enterprises

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing lime nitrogen from thiourea production waste residues is characterized in that the thiourea production waste residues are subjected to carbonization, desulfurization, filtration, drying, and grinding treatments, and then calcined with ammonia gas in an ammonia gas atmosphere to obtain lime nitrogen.

[0023] Its specific steps include:

[0024] (1) Carbonization: mix the thiourea production waste residue with water, stir it into a slurry, then feed a sufficient amount of carbon dioxide gas while stirring until the slurry pH=6;

[0025] (2) desulfurization: add desulfurizer to the slurry in (1), continue to stir and react to obtain desulfurization slurry;

[0026] (3) Filtration: filter the desulfurization slurry in (2) to obtain solid components and liquid components;

[0027] (4) drying: drying the solid components in (3);

[0028] (5) Grinding: Grinding the dried solid grinding components in (4) into powder with a particle size range of 8000-1...

Embodiment 2

[0036] A method for preparing lime nitrogen from thiourea production waste residues is characterized in that the thiourea production waste residues are subjected to carbonization, desulfurization, filtration, drying, and grinding treatments, and then calcined with ammonia gas in an ammonia gas atmosphere to obtain lime nitrogen.

[0037] Its specific steps include:

[0038] (1) Carbonization: mix the thiourea production waste residue with water, stir it into a slurry, then feed a sufficient amount of carbon dioxide gas while stirring until the slurry pH=5;

[0039] (2) desulfurization: add desulfurizer to the slurry in (1), continue to stir and react to obtain desulfurization slurry;

[0040] (3) Filtration: filter the desulfurization slurry in (2) to obtain solid components and liquid components;

[0041] (4) drying: drying the solid components in (3);

[0042] (5) Grinding: Grinding the dried solid grinding components in (4) into powder with a particle size range of 200-10...

Embodiment 3

[0050] A method for preparing lime nitrogen from thiourea production waste residues is characterized in that the thiourea production waste residues are subjected to carbonization, desulfurization, filtration, drying, and grinding treatments, and then calcined with ammonia gas in an ammonia gas atmosphere to obtain lime nitrogen.

[0051] Its specific steps include:

[0052] (1) Carbonization: mix the thiourea production waste residue with water, stir it into a slurry, then feed a sufficient amount of carbon dioxide gas while stirring until the slurry pH=6;

[0053] (2) desulfurization: add desulfurizer to the slurry in (1), continue to stir and react to obtain desulfurization slurry;

[0054] (3) Filtration: filter the desulfurization slurry in (2) to obtain solid components and liquid components;

[0055] (4) drying: drying the solid components in (3);

[0056] (5) Grinding: Grinding the dried solid grinding components in (4) into powder with a particle size range of 2000-5...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the field of chemical production, and particularly relates to a method for preparing lime nitrogen by using thiourea production waste residues. The method includes using the thiourea production waste residues as a raw material, conducting carbonization, desulfurization, filtration, drying and grinding treatment and burning with ammonia gas in the ammonia atmosphere for reaction to obtain the lime nitrogen. According to the method, the value of the thiourea residues can be developed and turned into wealth, and a cost-effective way for the reuse of the thiourea residuesand the preparation of the lime nitrogen is provided. At the same time, the refinery plant waste gas carbon dioxide can be effectively utilized to reduce emission of the carbon dioxide of a plant. Thefinally obtained lime nitrogen can be used in the production of the thiourea continuously, the recycling of the thiourea wastes can be achieved, and the environmental protection problem caused by solid waste residues can be solved.

Description

technical field [0001] The invention belongs to the field of chemical production, and in particular relates to a method for preparing lime nitrogen from thiourea production waste residue. Background technique [0002] As a chemical raw material, thiourea is widely used in the manufacture of medicines, dyes, resins, molding powders, etc. It is also used as a vulcanization accelerator for rubber and a flotation agent for metal minerals. At present, the industry mainly uses lime nitrogen and hydrogen sulfide as the main raw materials for production. The process principle is as follows: [0003] CaCN 2 +H 2 S+2H 2 O=CS(NH 2 ) 2 +Ca(OH) 2 [0004] This production process can produce a large amount of waste residues when obtaining thiourea products, and the main components of thiourea production waste residues are calcium hydroxide (50%-80%, mass content, the same below), moisture (10%-30%), Carbon powder (about 10%) and a small amount of thiourea and calcium sulfide, etc....

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/18
CPCC01C3/18
Inventor 马韵升张超梁万根刘军张宁崔卫华
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com